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首页> 外文期刊>Journal of Physical Oceanography >Enhanced 2-h-8-day Oscillations Associated with Tropical Instability Waves
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Enhanced 2-h-8-day Oscillations Associated with Tropical Instability Waves

机译：与热带不稳定波相关的增强的2小时8天振荡

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摘要

The westward South Equatorial Current (SEC) and eastward Equatorial Undercurrent (EUC) is a marginally stable current system due to the strong vertical shear. The existence of wavelike motions may locally reduce the Richardson number enough to trigger instabilities. Here, velocity measurements from the Tropical Atmosphere Ocean (TAO) array are used to examine the variability of oscillations within 0.125-12 cycles per day (cpd). It is found that the 0.125-12-cpd oscillations become more energetic in the presence of strong tropical instability waves (TIWs). The enhancement of shear variance is most pronounced around the EUC core (115 m), while prominent elevation of kinetic energy occurs around 85 m, where the EUC shear is strongest. Particularly, the energetic 0.125-12-cpd oscillations during strong TIW seasons do not cycle on a daily basis and are more evident during the southward phase of TIWs. The enhanced 0.125-12-cpd oscillations during strong TIW seasons can be ascribed neither to the changing background stratification nor to the vertical migration of EUC core at the corresponding time scales. Its strength is tightly correlated with the EUC shear and, to a lesser extent, the TIW shear. A partial correlation analysis suggests that the correlation to the TIW shear is mainly due to the association between EUC and TIW shear. The strength of the 0.125-12-cpd oscillations does not follow the variation of surface wind speed and wind curl, implying that they are not directly generated by surface wind forcing.
机译：由于强大的垂直剪切力，西赤道南流（SEC）和东赤道东流（EUC）是略微稳定的洋流系统。波浪运动的存在可能会局部降低Richardson数，足以触发不稳定性。在这里，来自热带大气海洋（TAO）阵列的速度测量用于检查每天0.125-12个周期（cpd）内的振荡变化。发现在强烈的热带不稳定波（TIW）的存在下，0.125-12-cpd的振荡变得更加活跃。剪切变化的增强在EUC核心（115 m）附近最为明显，而动能的显着升高发生在85 m处，其中EUC剪切最强。特别是，在TIW旺季期间，高能量的0.125-12-cpd振荡并不是每天循环的，而在TIW的南期阶段更为明显。在强TIW季节期间增强的0.125-12-cpd振荡既不能归因于变化的背景分层，也不能归因于EUC核心在相应时间尺度上的垂直迁移。它的强度与EUC剪切紧密相关，在较小程度上与TIW剪切紧密相关。部分相关分析表明，与TIW剪切的相关性主要是由于EUC与TIW剪切之间的相关性。 0.125-12-cpd振荡的强度不随表面风速和风卷曲的变化而变化，这意味着它们不是由表面风强迫直接产生的。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第7期|1908-1918|共11页
  • 作者

    Zhao Jing; Lixin Wu; Dexing Wu; Bo Qiu;

  • 作者单位

    Physical Oceanography Laboratory, Ocean University of China, Qingdao, China, and Department of Oceanography,Texas A&M University, College Station, Texas Department of Oceanography, Texas A&M University, MS 3146, College Station, TX 77840;

    Physical Oceanography Laboratory, Ocean University of China, Qingdao, China;

    Physical Oceanography Laboratory, Ocean University of China, Qingdao, China;

    Department of Oceanography, University of Hawai'i at Manoa, Honolulu, Hawaii;

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